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Topic: Auto_focus Acting Up (Read 3711 times)

Yesterday,when I tried out my 1DX,there were times when the auto=focusing had a hard time working or not working at all.A few times,I have to press the shuttet button(Both Vertical and Horizontal)harder to take a shot and there would be a few times when it wouldn't work.This is the first time that it has happened.By the way,this doesn't happen most of the time.Like I said,it was only the first time this has happened.It only happens about 5% to 10% of the time since yesterdayWould anyone out there know on what is happening.Is there anything wrong with the lens contact of the cameraOr,is there something wrong with the shutter release of my camera?You see,I tried out different lenses and still get the same problem.Thanks.

rj79in

What were the shooting conditions and what was the AF mode turned on in the camera? Check the settings for the Al Servo and whether it is on Focus priority. The shutter might not release till the AF locks on if that is the case.

No,I am not in Focus Priority.By the way,for your information,it doesn't happen most of the time.It only happens from time to time,especially if I just turn on the camera.It started acting like this only since yesterday and that is what puzzling me.

It's just a remote chance but check the electrical contact pins on the camera. Make they are clean and not bent or deformed. I had issues similar in the past and after cleaning the contact pins with contact cleaner formulated for gold pins the issues went away.

It's just a remote chance but check the electrical contact pins on the camera. Make they are clean and not bent or deformed. I had issues similar in the past and after cleaning the contact pins with contact cleaner formulated for gold pins the issues went away.

Yes,I'll do that.Thanks,everybody for all your inputs.

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I have the same problem with both of my bodies, in low light and trying to AF on fast-action. It boils down to the fact that I just don't think the 1DX's AF is as good as all the hype when it was first released, at least, that's the way I feel after having shot fall and winter sports exclusively with 1DX's.

I have the same problem with both of my bodies, in low light and trying to AF on fast-action. It boils down to the fact that I just don't think the 1DX's AF is as good as all the hype when it was first released, at least, that's the way I feel after having shot fall and winter sports exclusively with 1DX's.

While the 1dx is more weather resistant than the old camera body I had that developed this phenomenon, in my case it happened with more than one lens. Turns out that the shutter release button had gotten dirt/dust in it. There are tons of things on the internet on how to clean this yourself but given the risks, I opted to get it repaired. Had the shutter release replaced (was out of warranty) and camera cleaned for less than $150.

I have the same problem with both of my bodies, in low light and trying to AF on fast-action. It boils down to the fact that I just don't think the 1DX's AF is as good as all the hype when it was first released, at least, that's the way I feel after having shot fall and winter sports exclusively with 1DX's.

Yeah, indoors I never shoot narrower than f/2.8. The 70-200 f/2.8L II IS lens is probably the fastest focusing lens I shoot. That sucker focuses fast!

I've had that happen on many cameras, it sometimes took me a while to determine what I was doing to cause it. The 5D MK II was particularly bad because the depth of field button falls naturally under my left hand, and I sometimes pressed it. The Nikon D800 had a similar issue, there are two buttons that the fingertips of my right hand press when holding the camera by the grip in my right hand.I'd suspect its something simple, but it certainly could be a problem camera. Its not going to be the lens or contacts.

I have the same problem with both of my bodies, in low light and trying to AF on fast-action. It boils down to the fact that I just don't think the 1DX's AF is as good as all the hype when it was first released

I believe this is true. The Ai Servo AF on 1Dx and 5D III does not seem to warrant all the initial hoopla, especially in Ai Servo. However, I just got my 5D MkIII back from Canon Service, where I had it cleaned and checked before the warranty ran out. I did mention to them that the Al Servo mode seems to have tendency to misfocus, and the service summary mentions:

"Confirm autofocus to factory standard (Ai Servo). It was found that the adjustment of the AF assembly was incorrect, causing the focus to operate improperly. Electrical adjustments were carried out on the AF assembly. Product function was confirmed."

There is no way to perform proper A-B testing of Ai Servo in exact same situation pre and post "AF adjustment," but I do believe the Al Servo focusing is working perceptibly better now, which is very difficult to quantify. If your recent Canon body is having unusually worse-than-expected Ai Servo performance, it may (or may not) be worth it to have Canon Service check it out before warranty runs out. They probably need a cleaning anyway..